synopsis: (1) statistical uncertainty increase due to decrease of effective integration time, (2) systematic uncertainty decrease by removing anomalous data points.
limitations and applicability:
none
description:
Removal of a read-out plus remaining read-outs in a ramp as soon as
this read-out falls above a certain threshold level in Volts.
purpose correction:
Above the threshold voltage the voltage for each read-out does not
increase according to the photocurrent but remains at the same
voltage level or drops. These read-outs have to be removed.
uncertainty/noise introduced:
The effective integration time decreases with the fraction of the saturated
read-outs that have been removed. The loss in S/N depends on each specific
case - fortunately only a small fraction of all ISOPHOT data need this
correction.
auxillary data:
Threshold voltage levels for each detector subsystem.
keyword(s):
RAMPSAT: number of number of saturated ramps in measurement SPD header